12.0087 = 12.001 which is rounded to 12
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33.487 is already rounded to three decimal places. if it were 33.4829, which is four decimal places, you would round it to the nearest three DECIMAL places, which would be 33.487. So, the answer to your question is; 33.487 is already rounded to three decimal places.
2229.66 to 0 decimal places = 2230
2356164.38 already has only 2 decimal places, so there is no need to round it.
146.875 rounded to three decimal places is 147.
Rounded to three decimal places, this is equal to 1.397.